부식 억제제를 함유한 미세 고분자 캡슐 개발에 대한 연구
- 부식 억제제를 함유한 미세 고분자 캡슐 개발에 대한 연구
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- The idea for “The development of responsive minute polymer capsules filled with corrosion inhibitors” has been inspired by a self-healing coating for the corrosion control. In this thesis, the science and technology of a novel self-healing polymer material is described. In detail, minute polymeric capsules filled with corrosion inhibitors have been prepared and used in protective coating. Corrosion inhibitive pigments such as chromate are usually involved in the coating for corrosion protection. High performance corrosion inhibitive pigments are usually consisted of the heavy metal and inorganic salts which are under the discussion because of its toxicity to human and environment. Hence, organic corrosion inhibitors are suggested because of low toxicity and moderate corrosion protection performance. To incorporate the organic corrosion inhibitor into the coating, a carrier, which can store and release the materials on demand, is required to be developed. Many strategies such as using nanoporous layers, ion-exchangers and nanocontainers have recently been suggested to impart an active protection component to different coatings. However, these methods are difficult to approach and the efficiency is comparatively low. Sometimes, the materials preserving the active inhibitors are too large to load in the thin coating film. However, the polymer capsule developed here is adequately small to incorporate in the thin coating film, hundreds nanometer, and the manufacturing process is relatively simple and fast. The hollow capsule, which is prepared by sequential emulsion polymerization in an aqueous medium, was invited to contain corrosion inhibitors. The capsules allow the storage and release of encapsulated corrosion inhibitors on demand at a specific location in response to a very small trigger. The specific inhibitor used in this study is amphiphilic partial esters of phosphoric acid which has been demonstrated to maintain a stable passive film following damage of the coating. It has been found that the amount of encapsulated corrosion inhibitor depended on the partition coefficient and the encapsulated corrosion inhibitor was resided in the polymer which has similar partition coefficient with it. In addition, it has been found that the morphology of the hollow capsule could be manipulated by type of base employed and the process parameter control.
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